Movement:8215-JX.215N7G Number of Jewels��21 Frequency��21600/h Power Reservation��42h Waterproof depth:5ATM Functional Characteristics:OFF-Center dial,Wandering hours��one-hand time display Mirror material:Sapphire Crystal Strap material: Italian cowhide Buckle style:Pin buckle Strap width: 20mm Strap length: 210mm Case material: 316L stainless steel Case thickness: 12.7mm Case diameter: 40mm